126713281 has 4 divisors (see below), whose sum is σ = 128604592. Its totient is φ = 124821972.

The previous prime is 126713273. The next prime is 126713309. The reversal of 126713281 is 182317621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 182317621 = 107 ⋅1703903.

It is a cyclic number.

It is not a de Polignac number, because 126713281 - 2³ = 126713273 is a prime.

It is a super-2 number, since 2×126713281² = 32112511163569922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126713581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 945555 + ... + 945688.

It is an arithmetic number, because the mean of its divisors is an integer number (32151148).

Almost surely, 2^126713281 is an apocalyptic number.

It is an amenable number.

126713281 is a deficient number, since it is larger than the sum of its proper divisors (1891311).

126713281 is an equidigital number, since it uses as much as digits as its factorization.

126713281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1891310.

The product of its digits is 4032, while the sum is 31.

The square root of 126713281 is about 11256.6993830341. The cubic root of 126713281 is about 502.2740166839.

The spelling of 126713281 in words is "one hundred twenty-six million, seven hundred thirteen thousand, two hundred eighty-one".